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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Apr. 30, 2020 | Jun. 30, 2019
Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Net gain (loss) on foreign currency transactions |  | $ (0.1) | $ (0.1) |  | $ (0.7) |  |
Purchase price included in cash |  |  |  | $ 2.5 |  |  |
Assets acquired accrued Contingent Consideration |  | 1.3 |  | 1.3 |  |  |
Research and development expenses |  |  |  | 3.7 |  |  |
Liabilities recorded in acquisition |  | 1.5 |  | $ 1.5 |  |  |
Period for amount payable upon meeting milestones |  |  |  | December 2021 through December 2023 |  |  |
Long-term deferred tax asset |  | 0.3 |  | $ 0.3 |  |  |
Current assets held for sale |  | 12.5 |  | 12.5 |  |  |
Non-current assets held for sale |  | 17.6 |  | 17.6 |  |  |
Inventories |  | 95.5 |  | 95.5 |  |  | $ 158.7
Asset Purchase Agreement [Member] |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Cash consideration receivable on divestiture of business | $ 120.0 |  |  |  |  | $ 120.0 |
Percentage of purchase price of inventory | 5.00% |  |  |  |  |  |
Business divestiture closing | April 2020 |  |  |  |  |  |
Assets held for sale |  | 30.1 |  | 30.1 |  |  |
Current assets held for sale |  | 12.5 |  | 12.5 |  |  |
Non-current assets held for sale |  | 17.6 |  | 17.6 |  |  |
Inventories | $ 19.4 |  |  |  |  |  |
Contingent Consideration Milestones Payable Dates from December 2021 through December 2023 [Member] |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Purchase price in contingent consideration |  | $ 6.5 |  | 6.5 |  |  |
Maximum [Member] |  |  |  |  |  |  |
Basis Of Presentation [Line Items] |  |  |  |  |  |  |
Net gain (loss) on foreign currency transactions |  |  |  | $ 0.1 |  |  |

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